Gridless AYHW80G

It holds 74 gallons in the test, 6 gallons less than its 80-gallon sold size. It delivers 91 gallons of hot water in the test's first hour. Its tank holds 74 gallons, so reheating adds 17 gallons during the first hour. In the first hour, 43 of the 481 heat pump models give more hot water. The median heat pump model gives 72 gallons in the first hour of the test.

The single model number sold under it is ENERGY STAR certified. For each unit of energy it uses, 4.00 units end up in the hot water (its UEF). A UEF above 1 is possible because it moves heat from the air into the water. In the test, daily hot water use was set to high (its draw pattern). Among 237 heat pump models on its draw pattern, 70 have a higher UEF. For its type and draw pattern, the UEF runs from 2.85 to 4.95. When it reheats water in the test, the water gains 450% of the energy it uses.

Its test figures match those of 16 other basic models. In all, 15 other brands list one or more of them. For the full group, see the 1HVAC ACIQ-80G-HP-WH page.

It may qualify for 20 rebate programs in 19 states. Another 7 rebate programs may accept it if it meets their other terms.